The minimum vertical clearance of 19 feet above rails for trolley
span wires (Table
1, Case 2, Column C
) applies only to those railways which do not transport or propose to transport
freight cars. The minimum clearance shall not be less than 22 feet
where the railway involved does transport or propose to transport freight
cars.

Strike Out and Underline Version
Rule 77.4-A

77.4-A. Above Railways

The minimum vertical clearance of 19 feet above rails for trolley
span wires (Table 1, Case 2, Column C) applies only to those railways which
do not transport or propose to transport freight cars.
The minimum clearance shall not be less than 22 ½ feet where the railway
involved does transport or propose to transport freight cars.

Final Version
Rule 77.4-A

77.4-A. Above Railways

The minimum vertical clearance of 19 feet above rails for
trolley span wires (
Table 1, Case 2, Column C
) applies only to those railways which do not transport freight cars.
This minimum clearance shall be not less than 22 ½ feet where the
railway involved does transport or proposes to transport freight cars.